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It was observed recently that the allowable spread temperature for GE Frame 6 turbine is fluctuating between 100F and 300F. the fluctuation was due to changing the bias value from 100 to 200 constantly. i am after getting the source of this fluctuation.
Although the compressor discharge pressure (CPD) reading is steady, the turbine's 18 exhaust Thermocouples reading has average spread temperatures of (80, 75, 75). the allowable spread temperature keeps in changing from 100 to 300 F.
I would like to know what could cause this fluctuation to happen in the turbine exhaust allowable spread temperature?
The turbine is manufactured by GE and it is Frame 6 model that is controlled by Mark VI eTCSS.
Although the compressor discharge pressure (CPD) reading is steady, the turbine's 18 exhaust Thermocouples reading has average spread temperatures of (80, 75, 75). the allowable spread temperature keeps in changing from 100 to 300 F.
I would like to know what could cause this fluctuation to happen in the turbine exhaust allowable spread temperature?
The turbine is manufactured by GE and it is Frame 6 model that is controlled by Mark VI eTCSS.